Here is the requested code:
VIEW: (When the UNION below is commented out, the package runs as expected)
CREATE OR REPLACE FORCE VIEW "MY_ADMIN"."V_NOTIFICATIONS" AS
  SELECT N_ID,
    NOTIFICATION_TYPE,
    CASE WHEN NOTIFICATION_DESC = 'C' THEN 'Copy' ELSE 'Send to' END NOTIFICATION_DESC,
    CASE WHEN CONTACT_TYPE = 'D' THEN 'Department' ELSE 'Contact' END CONTACT_TYPE,
    A.AU_USER_ID,
    A.CONTACT_NAME,
    D.DEPARTMENT_ID,
    D.DEPT_DESC
  FROM NOTIFICATIONS AN,
    (SELECT A1.AU_USER_ID,
            AU.FIRST_NAME || ' ' || AU.LAST_NAME CONTACT_NAME
       FROM APP_USERS_CONTACT_INFO A1,
            APPLICATION_USERS AU
      WHERE A1.AU_USER_ID = AU.USER_ID
    /*UNION
     SELECT 0,
            NULL
       FROM DUAL*/) A,
    (SELECT DEPARTMENT_ID, 
            DESCRIPTION DEPT_DESC
       FROM DEPARTMENTS
      UNION
     SELECT 0 DEPARTMENT_ID,
            NULL DEPT_DESC 
       FROM DUAL) D
  WHERE NVL(AN.AU_USER_ID,0)      = A.AU_USER_ID
    AND NVL(AN.D_DEPARTMENT_ID,0) = D.DEPARTMENT_ID;
PACKAGE:
CREATE OR REPLACE PACKAGE NOTIFICATIONS_PKG AS
   PROCEDURE INSERT_NOTIFICATION(P_N_ROW V_NOTIFICATIONS%ROWTYPE);
END NOTIFICATIONS_PKG;
/
CREATE OR REPLACE PACKAGE BODY NOTIFICATIONS_PKG AS
   PROCEDURE INSERT_NOTIFICATION(P_N_ROW V_NOTIFICATIONS%ROWTYPE) IS
    L_NOTIFICATION_DESC    VARCHAR2(1);
    L_CONTACT_TYPE         VARCHAR2(1);
   BEGIN
      CASE P_N_ROW.NOTIFICATION_DESC
        WHEN 'Copy' THEN
          L_NOTIFICATION_DESC := 'C';
        ELSE
          L_NOTIFICATION_DESC := 'S';
      END CASE;
      CASE P_N_ROW.CONTACT_TYPE
        WHEN 'Department' THEN
          L_CONTACT_TYPE := 'D';
        ELSE
          L_CONTACT_TYPE := 'C';
      END CASE;
      INSERT INTO NOTIFICATIONS VALUES (
      P_N_ROW.N_ID,
      P_N_ROW.NOTIFICATION_TYPE,
      L_NOTIFICATION_DESC,
      L_CONTACT_TYPE,
      NVL(P_N_ROW.AU_USER_ID, 0),
      NVL(P_N_ROW.DEPARTMENT_ID, 0),
      APP_GLOBAL_PKG.GET_AUDIT);
   END INSERT_AGREEMENT_NOTIFICATION;
END AGREEMENT_NOTIFICATIONS_PKG;
The trigger is setup just to pass information to this package to insert the row. Upon trying to run the following line of code I receive the ORA-01031 error:
INSERT INTO V_AGREEMENT_NOTIFICATIONS VALUES (5781, 'Collateral Request', 'Send to', 'Contact', 797, '797T', 0, null);